Parity nonconservation in the γ decay of polarized $17/2^{-}$ isomers in ${}^{93}\mathrm{Tc}$

The determination of the $0^{°}-{180}^{°}$ asymmetry ($A_{\gamma }$), which arises because of the parity nonconserving matrix element, in the 751-keV γ decay of polarized $17/2^{-}$ isomers in ${}^{93}\mathrm{Tc}$ with respect to the direction of polarization is reported. A combined analysis of the present results together with those from our earlier work yields an effect of two standard deviations.

Figure 1

(Color online) A schematic view of the experimental setup.

Figure 2

A typical γ-ray spectrum from a partial data set of one of the Ge crystals.

Figure 3

(Color online) The triple ratios TR(i) for the overall combined values of all the runs for all the relevant isomer lines.